ICD-10-CM Code For Disorders Of Myoneural Junction And Muscle In Diseases Classified Elsewhere: Group Overview

The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group G73 includes disorders of the myoneural junction and skeletal muscle that arise as manifestations of other underlying diseases, such as neuromuscular transmission defects and secondary myopathies. These ICD-10-CM diagnosis codes are used to document clinical scenarios where neuromuscular weakness, fatigability, or muscle dysfunction occur in the context of a primary systemic or neurologic disorder, capturing disease severity and organ system involvement. Accurate coding within the ICD-10-CM G73 group supports complete clinical documentation and appropriate reimbursement.

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ICD-10-CM G73: Disorders Of Myoneural Junction And Muscle In Diseases Classified Elsewhere Overview

This group represents disorders affecting the myoneural junction and skeletal muscle that occur as manifestations of other systemic diseases. It targets neuromuscular transmission and muscle pathology secondary to underlying conditions and is used to classify those complications within the International Classification of Diseases, Tenth Revision, Clinical Modification. Accurate coding matters for complete clinical documentation and appropriate reimbursement because these codes link neuromuscular complications to the primary disease.

When to Use

Use codes from this group when a clinician documents neuromuscular junction dysfunction or muscle disease explicitly attributed to a primary systemic or neurologic condition. Select these codes to reflect the relationship between the primary diagnosis and the secondary neuromuscular or muscular manifestations in clinical records and claims.

ICD-10-CM Codes

3 rows

ICD-10-CM Code	Description
G73.1	Lambert-Eaton syndrome in neoplastic disease
G73.3	Myasthenic syndromes in other diseases classified elsewhere
G73.7	Myopathy in diseases classified elsewhere

DRG Codes

5 rows

DRG Code	Description
056	Degenerative Nervous System Disorders with MCC
057	Degenerative Nervous System Disorders without MCC
091	Other Disorders of Nervous System with MCC
092	Other Disorders of Nervous System with CC
093	Other Disorders of Nervous System without CC/MCC

Typical Clinical Scenarios

An elderly patient with long-standing chronic obstructive pulmonary disease presents with progressive proximal muscle weakness, difficulty rising from a chair, and muscle cramps over months; review of medications and history reveals long-term use of statins and a prior diagnosis of an autoimmune connective tissue disorder. A clinician assigns a code from this group when muscle weakness is thought to be due to an underlying systemic disease affecting muscle (myopathy in diseases classified elsewhere) after excluding primary muscle disease. Typical codes: G73.7
A middle-aged patient with known thymoma and fluctuating ptosis, diplopia, and episodic bulbar weakness arrives to the neurology clinic for evaluation after worsening symptoms triggered by infection; bedside edrophonium testing and serology support a neuromuscular transmission disorder associated with another condition. A code from this group is used to capture a disorder of the myoneural junction occurring in association with another systemic disease. Typical codes: G73.1, G73.3
A hospitalized patient with newly diagnosed metastatic cancer develops severe generalized weakness and respiratory compromise suspected to be paraneoplastic involvement of neuromuscular transmission; neurologic consultation documents a myasthenic syndrome attributed to the underlying malignancy. In this scenario a code from this group is assigned to describe a myoneural junction disorder secondary to a disease classified elsewhere and to guide concurrent inpatient problem lists. Typical codes: G73.1, G73.3

ICD-10-CM Code For Myasthenia Gravis And Other Myoneural Disorders: Group Overview

G71-PRIMARY-DISORDERS-OF-MUSCLES

ICD-10-CM Code For Primary Disorders Of Muscles: Group Overview

G72-OTHER-AND-UNSPECIFIED-MYOPATHIES

ICD-10-CM Code For Other And Unspecified Myopathies: Group Overview

Frequently Asked Questions

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.

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When to Use

ICD-10-CM Codes

3 rows

ICD-10-CM Code	Description
G73.1	Lambert-Eaton syndrome in neoplastic disease
G73.3	Myasthenic syndromes in other diseases classified elsewhere
G73.7	Myopathy in diseases classified elsewhere

DRG Codes

5 rows

DRG Code	Description
056	Degenerative Nervous System Disorders with MCC
057	Degenerative Nervous System Disorders without MCC
091	Other Disorders of Nervous System with MCC
092	Other Disorders of Nervous System with CC
093	Other Disorders of Nervous System without CC/MCC

Typical Clinical Scenarios

An elderly patient with long-standing chronic obstructive pulmonary disease presents with progressive proximal muscle weakness, difficulty rising from a chair, and muscle cramps over months; review of medications and history reveals long-term use of statins and a prior diagnosis of an autoimmune connective tissue disorder. A clinician assigns a code from this group when muscle weakness is thought to be due to an underlying systemic disease affecting muscle (myopathy in diseases classified elsewhere) after excluding primary muscle disease. Typical codes: G73.7
A middle-aged patient with known thymoma and fluctuating ptosis, diplopia, and episodic bulbar weakness arrives to the neurology clinic for evaluation after worsening symptoms triggered by infection; bedside edrophonium testing and serology support a neuromuscular transmission disorder associated with another condition. A code from this group is used to capture a disorder of the myoneural junction occurring in association with another systemic disease. Typical codes: G73.1, G73.3
A hospitalized patient with newly diagnosed metastatic cancer develops severe generalized weakness and respiratory compromise suspected to be paraneoplastic involvement of neuromuscular transmission; neurologic consultation documents a myasthenic syndrome attributed to the underlying malignancy. In this scenario a code from this group is assigned to describe a myoneural junction disorder secondary to a disease classified elsewhere and to guide concurrent inpatient problem lists. Typical codes: G73.1, G73.3

ICD-10-CM Code For Myasthenia Gravis And Other Myoneural Disorders: Group Overview

G71-PRIMARY-DISORDERS-OF-MUSCLES

ICD-10-CM Code For Primary Disorders Of Muscles: Group Overview

G72-OTHER-AND-UNSPECIFIED-MYOPATHIES

ICD-10-CM Code For Other And Unspecified Myopathies: Group Overview

Frequently Asked Questions

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.

Published by

Trek Health powers OpenPayer with a leading commercial payer intelligence platform, seamlessly converting fragmented payer data into actionable insights for provider organizations.

ICD-10-CM Code For Disorders Of Myoneural Junction And Muscle In Diseases Classified Elsewhere: Group Overview

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ICD-10-CM G73: Disorders Of Myoneural Junction And Muscle In Diseases Classified Elsewhere Overview

ICD-10-CM Code For Disorders Of Myoneural Junction And Muscle In Diseases Classified Elsewhere: Group Overview

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ICD-10-CM G73: Disorders Of Myoneural Junction And Muscle In Diseases Classified Elsewhere Overview

When to Use

ICD-10-CM Codes

DRG Codes

Typical Clinical Scenarios

Related Codes

References

When to Use

ICD-10-CM Codes

DRG Codes

Typical Clinical Scenarios

Related Codes

References

ICD-10-CM Code For Disorders Of Myoneural Junction And Muscle In Diseases Classified Elsewhere: Group Overview

Sign up for ICD-10-CM Code For Disorders Of Myoneural Junction And Muscle In Diseases Classified Elsewhere: Group Overview policy alerts

ICD-10-CM G73: Disorders Of Myoneural Junction And Muscle In Diseases Classified Elsewhere Overview

ICD-10-CM Code For Disorders Of Myoneural Junction And Muscle In Diseases Classified Elsewhere: Group Overview

Sign up for ICD-10-CM Code For Disorders Of Myoneural Junction And Muscle In Diseases Classified Elsewhere: Group Overview policy alerts

ICD-10-CM G73: Disorders Of Myoneural Junction And Muscle In Diseases Classified Elsewhere Overview

When to Use

ICD-10-CM Codes

DRG Codes

Typical Clinical Scenarios

Related Codes

Which conditions are included in ICD-10-CM group G73?

When should a coder assign a code from G73 rather than a primary neuromuscular diagnosis?

How does accurate coding in the G73 group affect reimbursement and documentation?

Which related DRGs may be impacted by diagnoses coded from G73?

What clinical scenarios does the G73 group capture according to the overview?

References

When to Use

ICD-10-CM Codes

DRG Codes

Typical Clinical Scenarios

Related Codes

Which conditions are included in ICD-10-CM group G73?

When should a coder assign a code from G73 rather than a primary neuromuscular diagnosis?

How does accurate coding in the G73 group affect reimbursement and documentation?

Which related DRGs may be impacted by diagnoses coded from G73?

What clinical scenarios does the G73 group capture according to the overview?

References